Limits on electron-neutrino oscillations from the GALLEX 51Cr source experiment

The recent result from the chromium source experiment carried out by the GALLEX collaboration implies interesting limits on the parameters Δm2 and sin2 2θ describing neutrino oscillations. Values of Δm2 > 0.17 eV2 for maximal mixing and of sin2 2θ > 0.38 for Δm2 > 1 eV2 are ruled out at 90% C.L. This result improves by more than an order of magnitude previous limits on Δm2 derived from electron-neutrino oscillation experiments at accelerators.